CN217769900U - Switching power supply with low standby power consumption - Google Patents
Switching power supply with low standby power consumption Download PDFInfo
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- CN217769900U CN217769900U CN202121997550.7U CN202121997550U CN217769900U CN 217769900 U CN217769900 U CN 217769900U CN 202121997550 U CN202121997550 U CN 202121997550U CN 217769900 U CN217769900 U CN 217769900U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a switching power supply with low standby power consumption, which comprises a main power supply unit and a standby power supply unit; the main power supply unit comprises an EMI filtering module, a rectifying module, a BUS BUS, a first transformer, a switching module, a first thermistor and a filtering module, wherein the switching module, the first thermistor and the filtering module are sequentially connected between the output end of the rectifying module and the input side of the first transformer in series; the EMI filtering module is used for connecting alternating current input and filtering and outputting the alternating current input to the input end of the rectifying module; the output end of the rectification module is connected with a BUS BUS; the input end of the standby power supply unit is connected with a BUS BUS so as to share an EMI filtering module and a rectifying module with the main power supply unit; the power output end of the switching module is connected with the power input end of the switching module to supply power to the switching module; the switching module comprises a relay, the relay is connected in series between the output end of the rectifying module and the first thermistor and is used for being closed or disconnected according to an external enabling signal so as to reduce the standby power consumption of the switching power supply.
Description
Technical Field
The utility model relates to a switching power supply technical field, concretely relates to switching power supply with low stand-by power consumption.
Background
The current high-power switching power supply comprises a main power supply unit and a standby power supply unit, wherein the standby power supply starts to work when the power supply is powered on, and the main power supply starts to work when an enable signal is provided outside.
Generally, the standby power consumption of a low-power supply can be below 50mW, but for a high-power supply, because a main power supply unit with larger output power exists in the high-power supply, an NTC thermistor and an input filter electrolytic capacitor with larger capacity are often added in the circuit design. The NTC thermistor is used for inhibiting startup surge current and preventing components from being damaged; the input filter electrolytic capacitor is used for converting the rectified pulsating direct current voltage into smooth direct current voltage, the capacity of the capacitor is related to the output power of the main power supply unit, and the output power is larger than the input filter electrolytic capacitor. Generally, both the NTC thermistor and the input filter electrolytic capacitor are loss devices, and although the NTC thermistor and the input filter electrolytic capacitor have little influence on the efficiency of the whole power supply, the NTC thermistor and the input filter electrolytic capacitor have great influence on the power supply with low standby power consumption, so that the standby power consumption of the switching power supply is not low.
In summary, there is still a need for further improvement in the prior art regarding switching power supplies.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned defect or the problem that exist among the background art, provide a switching power supply with low stand-by power consumption to reduce switching power supply's stand-by power consumption.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a switching power supply with low standby power consumption comprises a main power supply unit and a standby power supply unit, wherein the main power supply unit comprises an EMI filtering module, a rectifying module, a BUS (BUS) BUS, a first transformer, a switching module, a first thermistor and a filtering module, wherein the switching module, the first thermistor and the filtering module are sequentially connected between the output end of the rectifying module and the input side of the first transformer in series; the EMI filtering module is used for connecting alternating current input and filtering and outputting the alternating current input to the input end of the rectifying module; the output end of the rectification module is connected with a BUS; the input end of the standby power supply unit is connected with the BUS BUS so as to share the EMI filtering module and the rectifying module with the main power supply unit; the power output end of the switching module is connected with the power input end of the switching module to supply power to the switching module; the switching module comprises a relay, and the relay is connected between the output end of the rectifying module and the first thermistor in series and is used for being switched on or switched off according to an external enabling signal.
Further, the EMI filtering module comprises a fuse, a voltage dependent resistor, a first inductor, a first capacitor and a second inductor; the first inductor consists of a first coil and a second coil; the dotted terminal of the first coil is connected with a live wire of an alternating current input through a fuse; the dotted terminal of the second coil is connected with a zero line of the alternating current input; the piezoresistor is bridged between the homonymous ends of the first coil and the second coil; the second inductor consists of a third coil and a fourth coil; the homonymous end of the third coil is connected with the non-homonymous end of the first coil, and the non-homonymous end of the third coil is connected with the first input end of the rectifying module; the homonymous end of the fourth coil is connected with the non-homonymous end of the second coil, and the non-homonymous end of the fourth coil is connected with the second input end of the rectifying module; the first capacitor is connected between the dotted terminals of the third coil and the fourth coil in a bridge mode.
Furthermore, the rectification module comprises a first diode, a second diode, a third diode and a fourth diode which are connected in series in sequence; the anode of the first diode is connected with the anode of the fourth diode and grounded; the cathode of the first diode is used as a first input end of the rectifying module and is respectively connected with the anode of the second diode and the non-dotted end of the third coil; the cathode of the second diode is used as the output end of the rectifying module and is connected with the cathode of the third diode; and the anode of the third diode is used as a second input end of the rectifying module and is respectively connected with the cathode of the fourth diode and the non-dotted terminal of the fourth coil.
Further, the relay includes a first contact, a second contact, a third contact, and a fourth contact; the switching module further comprises a first resistor, a first triode and a fifth diode; one end of the first resistor is connected with an external enable signal, and the other end of the first resistor is connected with a base electrode of the first triode; the collector of the first triode is grounded, and the emitter of the first triode is connected with the anode of the fifth diode and the first contact of the relay; the second contact of the relay is connected with the power output end of the standby power supply unit; the third contact and the fourth contact are connected with a BUS BUS and are respectively connected with the cathode of the second diode and one end of the first thermistor.
Further, the first transformer includes a first primary winding; the filtering module comprises a plurality of electrolytic capacitors connected in parallel; the positive electrode of each electrolytic capacitor is respectively connected with the other end of the first thermistor and the non-dotted terminal of the first primary winding, and the negative electrode of each electrolytic capacitor is grounded.
Further, the first transformer further comprises a second primary winding and a first secondary winding; the main power supply unit also comprises a voltage stabilizing module, a pulse width modulation module, an auxiliary power supply module, a current sampling module and a controllable switch module; the controllable switch module comprises an MOS tube; the voltage stabilizing module is connected between the voltage output end of the first secondary winding and the feedback end of the pulse width modulation module in series and is used for controlling the duty ratio to stabilize output; the current sampling module is connected in series between the source electrode of the MOS tube and the current sampling end of the pulse width modulation module; the pulse width modulation module is used for outputting a PWM pulse signal according to the electric signals of the feedback end and the current sampling end of the pulse width modulation module so as to control the on-off of the MOS tube; the drain electrode of the MOS tube is connected with the non-homonymous end of the first primary winding; the input end of the auxiliary power supply module is connected with the dotted terminal of the second primary winding, and the output end of the auxiliary power supply module is connected with the power supply input end of the pulse width modulation module.
Furthermore, the pulse width modulation module comprises a first chip, a second thermistor, a fifth capacitor, a second resistor, a third resistor, a second triode and a fourth resistor; a first pin of the first chip is grounded through a second thermistor, a second pin of the first chip is grounded through a fifth capacitor as a feedback end, a third pin of the first chip is grounded as a current sampling end, a fourth pin of the first chip is grounded, and the fifth pin of the first chip is sequentially connected with a grid electrode of the MOS tube through a second resistor and a third resistor; the emitter of the second triode is connected with the grid of the MOS tube, the base of the second triode is connected between the second resistor and the third resistor, and the collector of the second triode is grounded through the fourth resistor.
Further, the current sampling module comprises a fifth resistor, a sixth resistor, a seventh resistor and a sixth capacitor; one end of the fifth resistor is used as the input end of the current sampling module and connected with the source electrode of the MOS tube, and the other end of the fifth resistor is used as the output end of the current sampling module and connected with the current sampling end of the pulse width modulation module and grounded through a sixth capacitor; two ends of the sixth resistor are respectively connected with the grid electrode and the source electrode of the MOS tube; two ends of the seventh resistor are respectively connected with the source electrode of the MOS tube and the ground; the auxiliary power supply module comprises a seventh capacitor, a sixth diode and an eighth resistor; one end of the eighth resistor is connected with the dotted end of the second primary winding, and the other end of the eighth resistor is connected with the anode of the sixth diode; and the cathode of the sixth diode is used as the output end of the auxiliary power supply, is connected with the non-dotted terminal of the second primary winding through the seventh capacitor and is grounded.
Further, the voltage stabilizing module comprises a four-terminal photoelectric coupler, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, an eighth capacitor and a seventh diode; one end of the ninth resistor is used as the input end of the voltage stabilizing module and connected with the voltage output end of the first secondary winding, and the other end of the ninth resistor is connected with the first end of the photoelectric coupler; the second end of the photoelectric coupler is connected with the cathode of the seventh diode, the third end of the photoelectric coupler is grounded, and the fourth end of the photoelectric coupler is connected with one end of the tenth resistor; the anode of the seventh diode is grounded; the other end of the tenth resistor is used as the output end of the voltage stabilizing module and is connected to the feedback end of the pulse width modulation module; the eleventh resistor is connected between the first end and the second end of the photoelectric coupler in a bridging mode; one end of the twelfth resistor is connected with the voltage output end of the first secondary winding, and the other end of the twelfth resistor is grounded through the thirteenth resistor; one end of the fourteenth resistor is connected with the anode of the seventh diode, and the other end of the fourteenth resistor is connected with one end of the eighth capacitor; the other end of the eighth capacitor is connected with the cathode of the seventh diode.
Further, the standby power supply unit includes a second chip, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, an eighteenth capacitor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, an eighth diode, a ninth diode, a twelfth diode, and a second transformer; the second transformer comprises a third primary winding, a fourth primary winding and a second secondary winding; the GND pin of the second chip is grounded; a VDD pin of the voltage regulator is grounded through a ninth capacitor and a tenth capacitor respectively and is also connected with a pin of an eighth diode through an eighteenth resistor; the FB pin of the inverter is connected with the dotted terminal of the fourth primary winding through a fifteenth resistor, and is also grounded through a sixteenth resistor and an eleventh capacitor respectively; the anode of the eighth diode is connected with the dotted terminal of the fourth primary winding; the cathode of the ninth diode is connected to the non-dotted terminal of the third primary winding through a nineteenth resistor and a twelfth capacitor; one end of the twentieth resistor is connected between the twelfth capacitor and the nineteenth resistor, and the other end of the twentieth resistor is connected to the non-dotted terminal of the third primary winding; the positive electrode of the eighteenth capacitor is connected with the non-homonymous end of the third primary winding and is connected to the BUS through the twenty-first resistor, and the cathode of the eighteenth capacitor is grounded; the anode of the twelfth polar tube is connected with the dotted terminal of the second secondary winding; the cathode of the standby power supply unit is used as a power supply output end of the standby power supply unit and is connected with the anode of the fourteenth capacitor and is grounded through the twenty-third resistor; the negative electrode of the fourteenth capacitor is connected with the non-dotted terminal of the second secondary winding and grounded; one end of the thirteenth capacitor is connected with the dotted terminal of the second secondary winding, and the other end of the thirteenth capacitor is connected with the cathode of the twelfth polar tube through the twelfth resistor.
As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages:
1. the switching module, the first thermistor and the filtering module are sequentially connected in series between the output end of the rectifying module and the input side of the first transformer, and the standby power supply unit and the main power supply unit are set to share the EMI filtering module and the rectifying module, so that when the power supply is in a standby state, the current flowing through the first thermistor and the filtering module in the main power supply unit can be controlled by controlling the on-off state of a relay in the switching module; when the external enable signal is at a low level, the relay is closed, current flows through the first thermistor and the filtering module, and the main power supply unit starts to work; when the external enable signal is in a high level, the relay is switched off, so that the standby power consumption of the power supply in the standby state is not influenced by the loss caused by the current flowing through the first thermistor and the filtering module; the mode that this setting was through changing the position of first thermistor and filter module and add the switching module for switching power supply can also avoid having the electric current to flow through the loss device and cause the loss under the condition that sets switching power supply's stand-by power supply unit and main power source unit to sharing rectification filter module among the prior art under the prerequisite that does not influence the effect that first thermistor restraines start-up surge current and filter module, influences stand-by power consumption's problem.
2. By providing a specific circuit structure of the EMI filtering module, the situation that current flows through a loss device to influence standby power consumption in a main power supply unit when the power supply is in a standby state is further ensured; and the EMI filtering module can effectively filter interference signals so as to improve the reliability of the switching power supply.
3. By providing the specific structure of the rectifying module and the connection mode of the rectifying module and the EMI filtering module, the switching power supply can convert alternating current input into direct current output.
4. Through providing the concrete circuit structure of switching module for the relay can make according to outside enable signal actuation or disconnection in order to control main power supply unit's operating condition, makes first thermistor and the filtering module on the main power supply unit can not have the electric current when the power is in standby state and pass through and cause the loss, and then influences the condition of standby power consumption.
5. The specific structure of the filter module and the connection relationship between the filter module and the first thermistor as well as the first primary winding are provided, so that the rectified pulse direct current is converted into a smooth direct current voltage.
6. Through setting up voltage stabilizing module, pulse width modulation module, auxiliary power source module, current sampling module and controllable switch module and providing the mode of the relation of connection between each module for switching power supply can let the MOS pipe carry out second rush modulation to input voltage through voltage stabilizing module and pulse width modulation module, and then realizes voltage transformation and exports stable voltage.
7. The specific circuit structure of the pulse width modulation module is provided, so that the pulse width modulation module can adjust the duty ratio according to the sampled electric signal to realize the control of the pulse width modulation module on the MOS tube.
8. The current sampling module is used for sampling the current of the MOS tube by the pulse width modulation module in a specific circuit structure mode, so that the safety and the stability of a product are improved; the power supply of the auxiliary power supply module to the pulse width modulation module is realized by providing a specific structure of the auxiliary power supply module.
9. By providing the specific circuit structure of the voltage stabilizing module and the connection mode of the voltage stabilizing module and the pulse width modulation module, the output voltage of the first transformer can be fed back to the feedback end of the pulse width modulation module, so that the purpose of stable output is achieved.
10. The power supply for the switching unit is realized by providing a specific circuit structure of the standby power supply unit and a connection mode of the standby power supply unit and the main power supply unit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a main power supply unit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a standby power supply unit according to an embodiment of the present invention.
Description of the main reference numbers:
a second chip U2; a ninth capacitor C9; a tenth capacitance C10; an eleventh capacitance C11; a twelfth capacitor C12; a thirteenth capacitor C13; a fourteenth capacitance C14; an eighteenth capacitor C18; a fifteenth resistor R15; a sixteenth resistor R16; a seventeenth resistor R17; an eighteenth resistor R18; a nineteenth resistor R19; a twentieth resistor R20; a twenty-first resistor R21;
a twenty-second resistor R22; a twenty-third resistor R23; an eighth diode D8; a ninth diode D9; a twelfth pole tube D10;
a second transformer T2;
a fuse F1; a varistor VDR1, a first inductor L1; a first capacitor C1; a second inductor L2;
a first diode D1; a second diode D2; a third diode D3; a fourth diode D4;
a first transformer T1;
a sixteenth capacitor C16, a seventeenth capacitor C17, a twenty fifth resistor R25, a twenty sixth resistor R26, a twenty seventh resistor R27, a twelfth diode D12, and a thirteenth diode D13;
the four-terminal photoelectric coupler PC1, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14 and an eighth capacitor C8; a seventh diode D7;
the circuit comprises a first chip U1, a second thermistor RT1, a fifth capacitor C5, a second resistor R2, a third resistor R3 and a second triode Q2; a fourth resistor R4;
a seventh capacitor C7; a sixth diode D6; an eighth resistor R8;
a fifth resistor R5; a sixth resistor R6; a seventh resistor R7; a sixth capacitor C6;
the MOS tube Q3, the eleventh diode D11 and the fifteenth capacitor C15; a twenty-fourth resistor R24;
a relay K1; a first resistor R1; a first triode Q1; a fifth diode D5;
a first thermistor NTC1;
a second capacitor C2; a third capacitor C3; and a fourth capacitor C4.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are preferred embodiments of the invention and should not be considered as excluding other embodiments. Based on the embodiment of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention.
In the claims, the specification and the drawings, unless otherwise expressly limited, the terms "first," "second," or "third," etc. are used for distinguishing between different elements and not for describing a particular sequence.
In the claims, the specification and the drawings, unless otherwise expressly limited, the terms "central", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise" and the like, with respect to the directional terms, indicate directions or positional relationships based on the directions and positional relationships shown in the drawings, and are only for convenience of description of the present invention and for simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of the present invention.
In the claims, the description and the drawings of the present application, unless otherwise expressly limited, the term "fixedly connected" or "fixedly connected" is used, which is to be understood broadly, that is, any connection mode without displacement relation or relative rotation relation between the two, that is, including non-detachably fixed connection, integrated connection and fixed connection through other devices or elements.
In the claims, the specification and the drawings, the terms "including", "comprising" and variations thereof, if used, are intended to be inclusive and not limiting.
Referring to fig. 1 to 2, the present invention discloses a switching power supply with low standby power consumption, which includes a main power supply unit and a standby power supply unit.
The main power supply unit comprises an EMI filtering module, a rectifying module, a BUS BUS, a first transformer T1, an output module, a voltage stabilizing module, a pulse width modulation module, an auxiliary power supply module, a current sampling module, a controllable switch module, a switching module, a first thermistor NTC1 and a filtering module, wherein the switching module, the first thermistor NTC1 and the filtering module are sequentially connected between the output end of the rectifying module and the input side of the first transformer T1 in series.
The EMI filtering module is used for connecting alternating current input and filtering and outputting the alternating current input to the input end of the rectifying module; in an embodiment of the present invention, the EMI filter module includes a fuse F1, a voltage dependent resistor VDR1, a first inductor L1, a first capacitor C1, and a second inductor L2; the device can filter interference signals in alternating current input, and is favorable for improving the reliability of the switching power supply.
The first inductor L1 is composed of a first coil and a second coil; the dotted terminal of the first coil is connected with a live wire of an alternating current input through a fuse F1; the homonymous end of the second coil is connected with a zero line of the alternating current input; the piezoresistor VDR1 is bridged between the dotted terminals of the first coil and the second coil; the second inductor L2 is composed of a third coil and a fourth coil; the homonymous end of the third coil is connected with the non-homonymous end of the first coil, and the non-homonymous end of the third coil is connected with the first input end of the rectifying module; the homonymous end of the fourth coil is connected with the non-homonymous end of the second coil, and the non-homonymous end of the fourth coil is connected with the second input end of the rectifying module; the first capacitor C1 is connected across the third coil and the fourth coil at the same name terminal.
The rectification module is used for converting alternating current input into direct current output, and the output end of the rectification module is connected with a BUS BUS; in an embodiment of the present invention, the rectifying module includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4 connected in series in sequence.
The anode of the first diode D1 is connected with the anode of the fourth diode D4 and grounded; the cathode of the first diode D1 is used as a first input end of the rectifying module and is respectively connected with the anode of the second diode D2 and the non-homonymous end of the third coil; the cathode of the second diode D2 is used as the output end of the rectifying module and is connected with the cathode of the third diode D3; the anode of the third diode D3 is used as the second input end of the rectifying module and is connected with the cathode of the fourth diode D4 and the non-dotted terminal of the fourth coil respectively.
The switching module comprises a relay K1, and the relay K1 is connected between the output end of the rectifying module and the first thermistor NTC1 in series and is used for being attracted or disconnected according to an external enabling signal; in an embodiment of the present invention, the relay K1 includes a first contact, a second contact, a third contact, and a fourth contact; the switching module further includes a first resistor R1, a first triode Q1, and a fifth diode D5.
One end of the first resistor R1 is connected with an external enabling signal, and the other end of the first resistor R1 is connected with the base electrode of the first triode Q1; the collector of the first triode Q1 is grounded, and the emitter of the first triode Q1 is connected with the anode of the fifth diode D5 and the first contact of the relay K1; the second contact of the relay K1 is connected with the power output end of the standby power supply unit; a third contact and a fourth contact of the first thermistor are connected with a BUS BUS and respectively connected with the cathode of a second diode D2 and one end of a first thermistor NTC1; the arrangement enables the current flowing through the first thermistor NTC1 and the filtering module in the main power supply unit to be controlled by controlling the on-off of the relay K1 in the switching module when the switching power supply is in a standby state; when the external enable signal is at a low level, the relay K1 is attracted, current flows through the first thermistor NTC1 and the filtering module, and the main power supply unit starts to work; when the external enable signal is at a high level, the relay K1 is turned off, and no current flows through the first thermistor NTC1 and the filtering module in the main power supply unit, so that the problem that the standby power consumption is influenced due to loss caused by the current flowing through the first thermistor NTC1 and the filtering module can be avoided; in addition, the first thermistor NTC1 is arranged in the relay K1 and the filtering module, so that the switching power supply can avoid the problem that the standby power consumption is influenced due to the loss caused by the current flowing through the loss device on the premise that the effects of the first thermistor NTC1 on restraining the startup inrush current and the filtering module are not influenced.
The first transformer T1 includes a first primary winding, a second primary winding, and a first secondary winding.
The filtering module comprises a plurality of electrolytic capacitors connected in parallel; the positive electrode of each electrolytic capacitor is respectively connected with the other end of the first thermistor NTC1 and the non-dotted end of the first primary winding, and the negative electrode of each electrolytic capacitor is grounded; in an embodiment of the present invention, the filtering module includes a second capacitor C2, a third capacitor C3 and a fourth capacitor C4 connected in parallel to each other.
The voltage stabilizing module is connected between the voltage output end of the first secondary winding and the feedback end of the pulse width modulation module in series and is used for controlling the duty ratio to stabilize output; in an embodiment of the present invention, the voltage stabilizing module includes a four-terminal photocoupler PC1, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, an eighth capacitor C8, and a seventh diode D7.
One end of a ninth resistor R9 is used as the input end of the voltage stabilizing module and is connected with the voltage output end of the first secondary winding, and the other end of the ninth resistor R9 is connected with the first end of the photoelectric coupler; the second end of the photoelectric coupler is connected with the cathode of a seventh diode D7, the third end of the photoelectric coupler is grounded, and the fourth end of the photoelectric coupler is connected with one end of a tenth resistor R10; the anode of the seventh diode D7 is grounded; the other end of the tenth resistor R10 is used as the output end of the voltage stabilizing module and is connected to the feedback end of the pulse width modulation module; the eleventh resistor R11 is connected between the first end and the second end of the photoelectric coupler in a bridge mode; one end of a twelfth resistor R12 is connected with the voltage output end of the first secondary winding, and the other end of the twelfth resistor R12 is grounded through a thirteenth resistor R13; one end of the fourteenth resistor R14 is connected to the anode of the seventh diode D7, and the other end thereof is connected to one end of the eighth capacitor C8; the other end of the eighth capacitor C8 is connected to the cathode of the seventh diode D7.
The output module comprises a sixteenth electric torch C16, a seventeenth capacitor C17, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twelfth diode D12 and a thirteenth diode D13.
The twelfth diode D12 and the thirteenth diode D13 are connected in parallel in the same direction, the anodes of the twelfth diode and the thirteenth diode are connected with the same-name end of the first secondary winding together, and the cathodes of the twelfth diode and the thirteenth diode are used as the voltage output end of the first secondary winding together; a twenty-fifth resistor R25 and a sixteenth resistor R16 are connected in parallel, one ends of the twenty-fifth resistor R25 and the sixteenth resistor R16 are connected in series with the first capacitor C1 and then connected to the end with the same name of the first secondary winding, and the other ends of the twenty-fifth resistor R25 and the sixteenth resistor R are connected to the voltage output end of the first secondary winding; one end of a seventeenth capacitor C17 is connected with the voltage output end of the first secondary winding, and the other end of the seventeenth capacitor C17 is grounded; a twenty-seventh resistor R27 is connected in parallel with the seventeenth capacitor C17.
The controllable switch module comprises an MOS transistor Q3, an eleventh diode D11, a fifteenth capacitor C15 and a twenty-fourth resistor R24; the drain electrode of the MOS tube Q3 is connected with the dotted terminal of the first primary winding; the anode of the eleventh diode D11 is connected to the dotted terminal of the first primary winding, and the cathode thereof is connected to the non-dotted terminal of the first primary winding through a fifteenth capacitor C15; a twenty-fourth resistor R24 is connected in parallel with the fifteenth capacitor C15.
The current sampling module is connected between the source electrode of the MOS tube Q3 and the current sampling end of the pulse width modulation module in series; in an embodiment of the present invention, the current sampling module includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and a sixth capacitor C6; one end of a fifth resistor R5 serving as the input end of the current sampling module is connected with the source electrode of the MOS tube Q3, and the other end of the fifth resistor R serving as the output end of the current sampling module is connected with the current sampling end of the pulse width modulation module and is grounded through a sixth capacitor C6; two ends of the sixth resistor R6 are respectively connected with the grid electrode and the source electrode of the MOS transistor Q3; two ends of the seventh resistor R7 are respectively connected with the source of the MOS transistor Q3 and the ground.
The pulse width modulation module is used for outputting a PWM pulse signal according to electric signals of a feedback end and a current sampling end of the pulse width modulation module so as to control the on-off of the MOS tube Q3; in an embodiment of the present invention, the pulse width modulation module includes a first chip U1, a second thermistor RT1, a fifth capacitor C5, a second resistor R2, a third resistor R3, a second triode Q2, and a fourth resistor R4; a first pin of the first chip U1 is grounded through a second thermistor RT1, a second pin of the first chip U1 is grounded through a fifth capacitor C5 as a feedback end, a third pin of the first chip U1 is grounded through a current sampling end, a fourth pin of the first chip U1 is grounded, and a fifth pin of the first chip U1 is sequentially connected with a grid electrode of the MOS transistor Q3 through a second resistor R2 and a third resistor R3; an emitting electrode of the second triode Q2 is connected with a grid electrode of the MOS tube Q3, a base electrode of the second triode Q2 is connected between the second resistor R2 and the third resistor R3, and a collector electrode of the second triode Q2 is grounded through a fourth resistor R4; in the embodiment of the present invention, the model of the first chip U1 is LD7750.
The input end of the auxiliary power supply module is connected with the dotted terminal of the second primary winding, and the output end of the auxiliary power supply module is connected with the power supply input end of the pulse width modulation module; in an embodiment of the present invention, the auxiliary power supply module includes a seventh capacitor C7, a sixth diode D6, and an eighth resistor R8; one end of the eighth resistor R8 is connected with the dotted end of the second primary winding, and the other end of the eighth resistor R8 is connected with the anode of the sixth diode D6; the cathode of the sixth diode D6 is connected as the output terminal of the auxiliary power supply to the non-dotted terminal of the second primary winding via the seventh capacitor C7 and is grounded.
The input end of the standby power supply unit is connected with the BUS BUS so as to share the EMI filtering module and the rectifying module with the main power supply unit; the power output end of the switching module is connected with the power input end of the switching module to supply power to the switching module; the standby power supply unit comprises a second chip U2, a ninth capacitor C9, a tenth capacitor C10, a first capacitor C1, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, an eighteenth capacitor C18, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, an eighth diode D8, a ninth diode D9, a twelfth diode D10 and a second transformer T2; the second transformer T2 includes a third primary winding, a fourth primary winding, and a second secondary winding; the GND pin of the second chip U2 is grounded; a pin VDD of the voltage regulator is grounded through a ninth capacitor C9 and a tenth capacitor C10 respectively, and is also connected with a pin of an eighth diode D8 through an eighteenth resistor R18; the FB pin is connected with the dotted terminal of the fourth primary winding through a fifteenth resistor R15, and is also grounded through a sixteenth resistor R16 and an eleventh capacitor C11 respectively, the CS pin is grounded through a seventeenth resistor R17, and the four SW pins are connected to the dotted terminal of the third primary winding and the anode of a ninth diode D9 together; the anode of the eighth diode D8 is connected to the dotted terminal of the fourth primary winding; the cathode of the ninth diode D9 is connected to the non-dotted terminal of the third primary winding through a nineteenth resistor R19 and a twelfth capacitor C12; one end of a twentieth resistor R20 is connected between the twelfth capacitor C12 and the nineteenth resistor R19, and the other end is connected to the non-dotted terminal of the third primary winding; the anode of the eighteenth capacitor C18 is connected with the non-homonymous end of the third primary winding and is connected to the BUS BUS through a twenty-first resistor R21, and the cathode of the eighteenth capacitor C is grounded; the anode of the twelfth pole tube D10 is connected with the end with the same name of the second secondary winding; the cathode of the standby power supply unit is used as the power supply output end of the standby power supply unit and is connected with the anode of a fourteenth capacitor C14 and is grounded through a twenty-third resistor R23; the negative electrode of the fourteenth capacitor C14 is connected with the non-dotted terminal of the second secondary winding and grounded; one end of the thirteenth capacitor C13 is connected to the end of the second secondary winding with the same name, and the other end is connected to the cathode of the twelfth diode D10 via a twelfth resistor R22.
To sum up, the utility model provides a switching power supply with low standby power consumption has effectively reduced switching power supply's standby power consumption.
The description of the above specification and examples is intended to illustrate the scope of the invention, but should not be construed as limiting the scope of the invention. Modifications, equivalents and other improvements which may be made to the embodiments of the invention or to some of the technical features thereof by a person of ordinary skill in the art through reasonable analysis, reasoning or limited experimentation based on the teachings of the invention or the above embodiments and/or the common general knowledge, the knowledge of the person of ordinary skill in the art and/or the prior art are all intended to be included within the scope of the invention.
Claims (10)
1. A switching power supply with low standby power consumption, comprising a main power supply unit and a standby power supply unit, characterized in that:
the main power supply unit comprises an EMI filtering module, a rectifying module, a BUS BUS, a first transformer, a switching module, a first thermistor and a filtering module, wherein the switching module, the first thermistor and the filtering module are sequentially connected between the output end of the rectifying module and the input side of the first transformer in series;
the EMI filtering module is used for connecting alternating current input and filtering and outputting the alternating current input and the filtering to the input end of the rectifying module; the output end of the rectification module is connected with the BUS;
the input end of the standby power supply unit is connected with the BUS BUS so as to share the EMI filtering module and the rectifying module with the main power supply unit; the power output end of the switching module is connected with the power input end of the switching module to supply power to the switching module;
the switching module comprises a relay which is connected in series between the output end of the rectifying module and the first thermistor and is used for being attracted or disconnected according to an external enabling signal.
2. A switching power supply with low standby power consumption according to claim 1, characterized in that:
the EMI filtering module comprises a fuse, a voltage dependent resistor, a first inductor, a first capacitor and a second inductor;
the first inductor consists of a first coil and a second coil; the homonymous end of the first coil is connected with the live wire of the alternating current input through the fuse; the dotted terminal of the second coil is connected with the zero line of the alternating current input;
the piezoresistor is bridged between the dotted terminals of the first coil and the second coil;
the second inductor is composed of a third coil and a fourth coil; the homonymous end of the third coil is connected with the non-homonymous end of the first coil, and the non-homonymous end of the third coil is connected with the first input end of the rectifying module; the homonymous end of the fourth coil is connected with the non-homonymous end of the second coil, and the non-homonymous end of the fourth coil is connected with the second input end of the rectifying module;
the first capacitor is connected between the dotted terminals of the third coil and the fourth coil in a bridge mode.
3. A switching power supply with low standby power consumption according to claim 2, characterized in that:
the rectifying module comprises a first diode, a second diode, a third diode and a fourth diode which are sequentially connected in series;
the anode of the first diode is connected with the anode of the fourth diode and grounded;
the cathode of the first diode is used as a first input end of the rectifying module and is respectively connected with the anode of the second diode and the non-homonymous end of the third coil;
the cathode of the second diode is used as the output end of the rectifying module and is connected with the cathode of the third diode;
and the anode of the third diode is used as a second input end of the rectifying module and is respectively connected with the cathode of the fourth diode and the non-homonymous end of the fourth coil.
4. A switching power supply with low standby power consumption according to claim 3, characterized in that: the relay comprises a first contact, a second contact, a third contact and a fourth contact; the switching module further comprises a first resistor, a first triode and a fifth diode;
one end of the first resistor is connected with the external enable signal, and the other end of the first resistor is connected with the base electrode of the first triode; the collector of the first triode is grounded, and the emitter of the first triode is connected with the anode of the fifth diode and the first contact of the relay;
the second contact of the relay is connected with the power output end of the standby power supply unit; and a third contact and a fourth contact of the first thermistor are connected with the BUS BUS and respectively connected with a cathode of the second diode and one end of the first thermistor.
5. A switching power supply with low standby power consumption according to claim 4, characterized in that: the first transformer comprises a first primary winding; the filtering module comprises a plurality of electrolytic capacitors connected in parallel; the positive electrode of each electrolytic capacitor is respectively connected with the other end of the first thermistor and the non-dotted end of the first primary winding, and the negative electrode of each electrolytic capacitor is grounded.
6. A switching power supply with low standby power consumption according to claim 5, characterized in that: the first transformer further comprises a second primary winding and a first secondary winding; the main power supply unit also comprises a voltage stabilizing module, a pulse width modulation module, an auxiliary power supply module, a current sampling module and a controllable switch module; the controllable switch module comprises a MOS tube,
the voltage stabilizing module is connected between the voltage output end of the first secondary winding and the feedback end of the pulse width modulation module in series and is used for controlling the duty ratio to stabilize the output;
the current sampling module is connected between the source electrode of the MOS tube and the current sampling end of the pulse width modulation module in series;
the pulse width modulation module is used for outputting a PWM pulse signal according to electric signals of a feedback end and a current sampling end of the pulse width modulation module so as to control the on-off of the MOS tube;
the drain electrode of the MOS tube is connected with the non-homonymous end of the first primary winding;
the input end of the auxiliary power supply module is connected with the dotted terminal of the second primary winding, and the output end of the auxiliary power supply module is connected with the power supply input end of the pulse width modulation module.
7. A switching power supply with low standby power consumption according to claim 6, characterized in that: the pulse width modulation module comprises a first chip, a second thermistor, a fifth capacitor, a second resistor, a third resistor, a second triode and a fourth resistor;
a first pin of the first chip is grounded through the second thermistor, a second pin of the first chip is grounded through the fifth capacitor as the feedback end, a third pin of the first chip is grounded as the current sampling end, a fourth pin of the first chip is grounded, and a fifth pin of the first chip is sequentially connected with a grid electrode of the MOS tube through the second resistor and the third resistor;
and the emitter of the second triode is connected with the grid of the MOS tube, the base of the second triode is connected between the second resistor and the third resistor, and the collector of the second triode is grounded through the fourth resistor.
8. A switching power supply with low standby power consumption according to claim 7, characterized in that: the current sampling module comprises a fifth resistor, a sixth resistor, a seventh resistor and a sixth capacitor;
one end of the fifth resistor is used as the input end of the current sampling module and connected with the source electrode of the MOS tube, and the other end of the fifth resistor is used as the output end of the current sampling module and connected with the current sampling end of the pulse width modulation module and grounded through the sixth capacitor;
two ends of the sixth resistor are respectively connected with the grid electrode and the source electrode of the MOS tube;
two ends of the seventh resistor are respectively connected with the source electrode of the MOS tube and the ground;
the auxiliary power supply module comprises a seventh capacitor, a sixth diode and an eighth resistor;
one end of the eighth resistor is connected with the dotted end of the second primary winding, and the other end of the eighth resistor is connected with the anode of the sixth diode;
and the cathode of the sixth diode is used as the output end of the auxiliary power supply, is connected with the non-dotted terminal of the second primary winding through the seventh capacitor and is grounded.
9. A switching power supply with low standby power consumption as claimed in claim 8, characterized in that: the voltage stabilizing module comprises a four-end photoelectric coupler, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, an eighth capacitor and a seventh diode;
one end of the ninth resistor is used as the input end of the voltage stabilizing module and is connected with the voltage output end of the first secondary winding, and the other end of the ninth resistor is connected with the first end of the photoelectric coupler;
a second end of the photoelectric coupler is connected with a cathode of the seventh diode, a third end of the photoelectric coupler is grounded, and a fourth end of the photoelectric coupler is connected with one end of the tenth resistor; the anode of the seventh diode is grounded;
the other end of the tenth resistor is used as the output end of the voltage stabilizing module and is connected to the feedback end of the pulse width modulation module;
the eleventh resistor is connected between the first end and the second end of the photoelectric coupler in a bridge mode;
one end of the twelfth resistor is connected with the voltage output end of the first secondary winding, and the other end of the twelfth resistor is grounded through the thirteenth resistor;
one end of the fourteenth resistor is connected with the anode of the seventh diode, and the other end of the fourteenth resistor is connected with one end of the eighth capacitor; the other end of the eighth capacitor is connected with the cathode of the seventh diode.
10. A switching power supply with low standby power consumption according to claim 1, characterized in that: the standby power supply unit comprises a second chip, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, an eighteenth capacitor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, an eighth diode, a ninth diode, a twelfth diode and a second transformer; the second transformer comprises a third primary winding, a fourth primary winding and a second secondary winding;
the GND pin of the second chip is grounded; a VDD pin of the second diode is grounded through the ninth capacitor and the tenth capacitor respectively, and is also connected with a pin of the eighth diode through the eighteenth resistor; the FB pin is connected with the dotted terminal of the fourth primary winding through the fifteenth resistor, and is also grounded through the sixteenth resistor and the eleventh capacitor, respectively, the CS pin is grounded through the seventeenth resistor, and the four SW pins are connected to the dotted terminal of the third primary winding and the anode of the ninth diode together;
the anode of the eighth diode is connected with the dotted terminal of the fourth primary winding;
the cathode of the ninth diode is connected to the non-dotted terminal of the third primary winding through the nineteenth resistor and the twelfth capacitor;
one end of the twentieth resistor is connected between the twelfth capacitor and the nineteenth resistor, and the other end of the twentieth resistor is connected to the non-dotted terminal of the third primary winding;
the positive electrode of the eighteenth capacitor is connected with the non-homonymous terminal of the third primary winding and is connected to the BUS through the twenty-first resistor, and the cathode of the eighteenth capacitor is grounded;
the anode of the twelfth polar tube is connected with the dotted terminal of the second secondary winding; the cathode of the standby power supply unit is used as a power supply output end of the standby power supply unit and is connected with the anode of the fourteenth capacitor, and the cathode of the standby power supply unit is grounded through the twenty-third resistor;
the negative electrode of the fourteenth capacitor is connected with the non-dotted terminal of the second secondary winding and grounded;
one end of the thirteenth capacitor is connected with the dotted end of the second secondary winding, and the other end of the thirteenth capacitor is connected with the cathode of the twelfth polar tube through the twenty-second resistor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121997550.7U CN217769900U (en) | 2021-08-24 | 2021-08-24 | Switching power supply with low standby power consumption |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121997550.7U CN217769900U (en) | 2021-08-24 | 2021-08-24 | Switching power supply with low standby power consumption |
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| Publication Number | Publication Date |
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| CN217769900U true CN217769900U (en) | 2022-11-08 |
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2021
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